一全文逐句语法解读
本课围绕 受伤求助，重点是 宾语从句（I think that… / I'm sure that… / The doctor says that…）与 现在完成时 表结果。
¶ 1 · 宾语从句（句 6、12、13、15、16）
| 句子 | 语法点 |
|---|
| I think that I've hurt my back. | 宾语从句 that 引导从句，口语中常省略 |
| I'm afraid that I can't get up. | I'm afraid that… 表委婉的担心 |
| The doctor says that he will come at once. | 主句为一般现在时，从句时态不受限 |
| I'm sure that you need an X-ray. | I'm sure that… 表确信 |
¶ 2 · 现在完成时表结果（句 4、6）
| 句子 | 语法点 |
|---|
| Have you hurt yourself? | hurt 的过去式和过去分词同形；反身代词 yourself |
| I've hurt my back. | 完成时表受伤已造成的结果 |
| Yes, I have. | 简略答语：Yes, I have. / No, I haven't. |
¶ 3 · 请求与帮助（句 7、10、13）
| 句子 | 语法点 |
|---|
| Try and stand up. | try and do = try to do，口语形式 |
| Let me help you. | Let me… 表主动提供帮助 |
| the doctor had better see you | had better + 动词原形，表“最好” |
二固定搭配与重点词组
| 短语 | 用法与例句 |
|---|
| fall downstairs | 从楼梯上摔下来。fall → fell → fallen。 |
| stand up | 起立，站起来。 |
| at once | 立刻，马上。 |
| an X-ray | X 光透视。 |
| had better + 动词原形 | 最好做……。 |
| hurt oneself | 伤着自己。hurt 过去式、过去分词同形。 |
三语法核心总结
- I think / I'm sure / I'm afraid + that 从句：that 在口语中常省略。
- hurt 的过去式与过去分词同形（hurt, hurt）。
- at once 表“立刻”；had better 后接动词原形。
- 本课生词 11 个全部嵌入课文句子，无遗漏。